I would look at a smaller linear slide.here are a few setup I have build and used, I have not tested the last one but I think the spring pressure is better.You can setup how much pressure is on the scribe by where you set Z "0" at the start of the series.It could not be used with a scribe and then cut operation the other type can.

I was thinking of building my own using a couple different methods. A slide that moves down has other advantages as well. The CP9361 does not always start when set to a setting less than 4. A light tap on the tip will always start it. By activating a slide, the scribe will always start when the tip hits the material even at the lowest setting. I could do this with the Z axis if it was spring loaded as well, but need to test it.

I like the first one with the dedicated linear slide. Very small and simple. Do you have a source for a guide that small? Also what cylinder are you using?

Ok, one thing I found was that the air solenoid used is crucial in the engraver firing constantly. I started with a smaller 12v activated unit and while it worked ok, I would still get misfires. It has a couple of issues.

1. It does not allow enough air volume to hit the tool all at once. 2. It had no exhaust so the tool would slowly let out air once deactivated. This, Along with problem 1 would cause the misfires.

Here is what I did. I went with a 5-way 2-position valve (110v). These allow you to fire a two way cylinder and control the exhaust in both directions. (Not using this feature)

The B valve is plugged and the A is connected to the tool. Both exhaust ports are left wide open.

OMG..... The tool fires every single time at any setting.

I will be experimenting with ways of controlling the height of the tool. For now its on a custom made 8mm rod system with 8mm trucks. I will be looking at a two way cylinder, Servo, Stepper to control just the tool. Right now its floating and I use my Z-axis to control its contact with the surface.